2007 Mercedes C-Class Owner's Manual - Page 191
2007 Mercedes C-Class Manual
Page 191 highlights
Controls in detail Audio system Button and soft key operation In these instructions, the alphanumeric keypad (right side of radio panel) and the function buttons (left side of radio panel) are referred to as "buttons". The four keys below the display panel are referred to as "soft keys". Operation Switching the unit on/off Switching on Turn the SmartKey in the starter switch to position 1 or 2. If the audio system was on as you removed the SmartKey from the starter switch, the audio system will automatically come back on as you turn the SmartKey to position 1 or 2. or Press M button. Switching off Remove SmartKey from starter switch. or Press M button. ! Do not press directly in the display face. Otherwise, the display will be damaged. i Should excessively high temperatures occur while the audio system is being operated, the display will dim. If temperatures continue to rise, HIGH TEMP will appear in the display, after which the audio system will be switched off for a cooling-down period. Adjusting the volume Turn rotary control of N button. The volume will increase or decrease depending on the direction turned. i If the radio is switched on without the SmartKey in the starter switch, it will automatically switch off again after approx. 30 minutes. If your vehicle is equipped with a telephone, the display may prompt you to enter your PIN (GSM network) or code (TDMA or CDMA network). i If your vehicle equipment includes a Mercedes-Benz specified mobile telephone*, you can adjust its volume separately from the volume of the audio system while the telephone is being used. 190